Affiliation: | 1. Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea;3. Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville, Tennessee;4. Medical Research Institute, College of Medicine, Ewha Womans University, Seoul, Korea;5. Department of Pediatrics, Korea University Ansan Hospital, Ansan, Korea |